Henry r



(NbModeLY I H'. PRIGTIONAL CONTROL NO. 575,016.

R. TOWNE, I LING DEVICE FOR SGREWHOISTS.

Patented-Jan. 12, 1897.

-UNITED STATES PATENT FFICE.

HENRY R. TOWNE, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE dc TOWNEMANUFACTURING COMPANY, OF SAME PLACE.

FRICTIONAL CONTROLLING DEVICE FOR SCREW-HOISTS.

SPECIFICATION forming part Of Letters Patent No. 575,016, dated January12, 1897.

Application filed May 22, 1894. Serial No- 512,106. (No model.)

To aZZ whom it may concern.-

Be it known that I, HENRY R. TOWNE, a citizen of the United States,residing at Stamford, in the county of Fairfield and State ofConnecticut, have invented a new and useful Improvement in FrictionalControlling Devices for Screw-Hoists, of which the folv lowingspecification, taken in connection with in the lower part of the casing4. and provided on its projecting end with a power-wheel, which is notshown.

5 is a friction-block seated in a recess or opening 6, formed in thecasing 4 adjacent to a face of the worm-wheel l.

7 is the adj usting-screw, working in a screwthreaded opening which istapped through the casing 4. into the opening or recess 6 and is adaptedto bear against an interposed spring 8.

9 is a clamping-nut for holding the adj usting-screw 7 in any desiredadjusted position.

It will be observed that by means of the screw 7 the pressure of thefriction-block 5 upon the face of the worm-wheel 1 can be regulated atwill to control the action of the hoist.

Having thus fully described my invention, the following is what I claimas new therein and desire to secure by Letters Patent:

A screw-hoist comprising a worm-wheel having gudgeons 2, a worm-shaft 3,a casing 4 in which the gudgeons are journaled, having an opening 6, afriction-block 5 mounted in the opening, an adjusting-screw 7 Workingthrough the casing, a spring 8 interposed between the block and thescrew, and a clamping-nut 9, for locking the screw; substantially asdescribed.

HENRY R. TOWVNE.

IVitnesses:

ScHUYLER MERRITT, GEO. E. WHITE.

